What race was Legolas?

[Morgul Queen]

While not Silvan by blood...

Though the Silvan elves were more or less exclusively Nandorin in their beginnings, this had obviously changed in the Third Age. Thus, you don't see any Silvan elves identified by their traditional 'kindred' names from earlier ages

But the stories of the third age are told either from the point of view of the Noldor, who tend to re-name everyone, or the Hobbit, who aren't the most knowledgable about the elves. Nothing is really given from the POV of the 'Silvan' elves themselves.